A friend and I managed to get WiFi working on my board with an Intel 512AN_MMW card. The only thing we needed to add was the firmware files (*.ucode) and those was copied over via a loop mount of the image-full-clanton.ext3 file. We simply copied over all the *.ucode files that was on my friends laptop (running Linux).
I have just tried to do the same loop mount via a Linux virtual machine on my Mac, and that seems to work just fine, reading the SD card via a USB card reader.
Driver for the above card seems to be there already.